Take a look at the original sentence again:
The terrified passengers aboard the 747 gripped their armrests as the jet
bucked in a bad stretch of turbulence after
a ride like this one, everyone knew that five minutes on Disney's Space
Mountain would feel like relaxing in a rocking chair.
You wanted to fix it this way:
The terrified passengers aboard the 747 gripped their armrests as the jet
bucked in a bad stretch of turbulence; After
a ride like this one, everyone knew that five minutes on Disney's Space
Mountain would feel like relaxing in a rocking chair.
A semicolon is an excellent method for fixing a fused sentence. When you choose this option, however, you must use it correctly. Do not capitalize the word that follows the semicolon unless the word is a proper noun, one that is always capitalized.
You might want to consult the rules for fixing comma splices and fused sentences.
Go back to the sentence to try again.